Merge branch 'maint'
[git/jrn.git] / http.c
blobb0499482455e256a3c2c9b6498b21c32d328c5c9
1 #include "http.h"
2 #include "pack.h"
4 int data_received;
5 int active_requests;
6 int http_is_verbose;
8 #ifdef USE_CURL_MULTI
9 static int max_requests = -1;
10 static CURLM *curlm;
11 #endif
12 #ifndef NO_CURL_EASY_DUPHANDLE
13 static CURL *curl_default;
14 #endif
16 #define PREV_BUF_SIZE 4096
17 #define RANGE_HEADER_SIZE 30
19 char curl_errorstr[CURL_ERROR_SIZE];
21 static int curl_ssl_verify = -1;
22 static const char *ssl_cert;
23 #if LIBCURL_VERSION_NUM >= 0x070903
24 static const char *ssl_key;
25 #endif
26 #if LIBCURL_VERSION_NUM >= 0x070908
27 static const char *ssl_capath;
28 #endif
29 static const char *ssl_cainfo;
30 static long curl_low_speed_limit = -1;
31 static long curl_low_speed_time = -1;
32 static int curl_ftp_no_epsv;
33 static const char *curl_http_proxy;
34 static char *user_name, *user_pass;
36 static struct curl_slist *pragma_header;
37 static struct curl_slist *no_pragma_header;
39 static struct active_request_slot *active_queue_head;
41 size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
43 size_t size = eltsize * nmemb;
44 struct buffer *buffer = buffer_;
46 if (size > buffer->buf.len - buffer->posn)
47 size = buffer->buf.len - buffer->posn;
48 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
49 buffer->posn += size;
51 return size;
54 #ifndef NO_CURL_IOCTL
55 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
57 struct buffer *buffer = clientp;
59 switch (cmd) {
60 case CURLIOCMD_NOP:
61 return CURLIOE_OK;
63 case CURLIOCMD_RESTARTREAD:
64 buffer->posn = 0;
65 return CURLIOE_OK;
67 default:
68 return CURLIOE_UNKNOWNCMD;
71 #endif
73 size_t fwrite_buffer(const void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
75 size_t size = eltsize * nmemb;
76 struct strbuf *buffer = buffer_;
78 strbuf_add(buffer, ptr, size);
79 data_received++;
80 return size;
83 size_t fwrite_null(const void *ptr, size_t eltsize, size_t nmemb, void *strbuf)
85 data_received++;
86 return eltsize * nmemb;
89 static void finish_active_slot(struct active_request_slot *slot);
91 #ifdef USE_CURL_MULTI
92 static void process_curl_messages(void)
94 int num_messages;
95 struct active_request_slot *slot;
96 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
98 while (curl_message != NULL) {
99 if (curl_message->msg == CURLMSG_DONE) {
100 int curl_result = curl_message->data.result;
101 slot = active_queue_head;
102 while (slot != NULL &&
103 slot->curl != curl_message->easy_handle)
104 slot = slot->next;
105 if (slot != NULL) {
106 curl_multi_remove_handle(curlm, slot->curl);
107 slot->curl_result = curl_result;
108 finish_active_slot(slot);
109 } else {
110 fprintf(stderr, "Received DONE message for unknown request!\n");
112 } else {
113 fprintf(stderr, "Unknown CURL message received: %d\n",
114 (int)curl_message->msg);
116 curl_message = curl_multi_info_read(curlm, &num_messages);
119 #endif
121 static int http_options(const char *var, const char *value, void *cb)
123 if (!strcmp("http.sslverify", var)) {
124 curl_ssl_verify = git_config_bool(var, value);
125 return 0;
127 if (!strcmp("http.sslcert", var))
128 return git_config_string(&ssl_cert, var, value);
129 #if LIBCURL_VERSION_NUM >= 0x070903
130 if (!strcmp("http.sslkey", var))
131 return git_config_string(&ssl_key, var, value);
132 #endif
133 #if LIBCURL_VERSION_NUM >= 0x070908
134 if (!strcmp("http.sslcapath", var))
135 return git_config_string(&ssl_capath, var, value);
136 #endif
137 if (!strcmp("http.sslcainfo", var))
138 return git_config_string(&ssl_cainfo, var, value);
139 #ifdef USE_CURL_MULTI
140 if (!strcmp("http.maxrequests", var)) {
141 max_requests = git_config_int(var, value);
142 return 0;
144 #endif
145 if (!strcmp("http.lowspeedlimit", var)) {
146 curl_low_speed_limit = (long)git_config_int(var, value);
147 return 0;
149 if (!strcmp("http.lowspeedtime", var)) {
150 curl_low_speed_time = (long)git_config_int(var, value);
151 return 0;
154 if (!strcmp("http.noepsv", var)) {
155 curl_ftp_no_epsv = git_config_bool(var, value);
156 return 0;
158 if (!strcmp("http.proxy", var))
159 return git_config_string(&curl_http_proxy, var, value);
161 /* Fall back on the default ones */
162 return git_default_config(var, value, cb);
165 static void init_curl_http_auth(CURL *result)
167 if (user_name) {
168 struct strbuf up = STRBUF_INIT;
169 if (!user_pass)
170 user_pass = xstrdup(getpass("Password: "));
171 strbuf_addf(&up, "%s:%s", user_name, user_pass);
172 curl_easy_setopt(result, CURLOPT_USERPWD,
173 strbuf_detach(&up, NULL));
177 static CURL *get_curl_handle(void)
179 CURL *result = curl_easy_init();
181 if (!curl_ssl_verify) {
182 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
183 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
184 } else {
185 /* Verify authenticity of the peer's certificate */
186 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
187 /* The name in the cert must match whom we tried to connect */
188 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
191 #if LIBCURL_VERSION_NUM >= 0x070907
192 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
193 #endif
195 init_curl_http_auth(result);
197 if (ssl_cert != NULL)
198 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
199 #if LIBCURL_VERSION_NUM >= 0x070903
200 if (ssl_key != NULL)
201 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
202 #endif
203 #if LIBCURL_VERSION_NUM >= 0x070908
204 if (ssl_capath != NULL)
205 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
206 #endif
207 if (ssl_cainfo != NULL)
208 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
209 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
211 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
212 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
213 curl_low_speed_limit);
214 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
215 curl_low_speed_time);
218 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
220 if (getenv("GIT_CURL_VERBOSE"))
221 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
223 curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
225 if (curl_ftp_no_epsv)
226 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
228 if (curl_http_proxy)
229 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
231 return result;
234 static void http_auth_init(const char *url)
236 char *at, *colon, *cp, *slash;
237 int len;
239 cp = strstr(url, "://");
240 if (!cp)
241 return;
244 * Ok, the URL looks like "proto://something". Which one?
245 * "proto://<user>:<pass>@<host>/...",
246 * "proto://<user>@<host>/...", or just
247 * "proto://<host>/..."?
249 cp += 3;
250 at = strchr(cp, '@');
251 colon = strchr(cp, ':');
252 slash = strchrnul(cp, '/');
253 if (!at || slash <= at)
254 return; /* No credentials */
255 if (!colon || at <= colon) {
256 /* Only username */
257 len = at - cp;
258 user_name = xmalloc(len + 1);
259 memcpy(user_name, cp, len);
260 user_name[len] = '\0';
261 user_pass = NULL;
262 } else {
263 len = colon - cp;
264 user_name = xmalloc(len + 1);
265 memcpy(user_name, cp, len);
266 user_name[len] = '\0';
267 len = at - (colon + 1);
268 user_pass = xmalloc(len + 1);
269 memcpy(user_pass, colon + 1, len);
270 user_pass[len] = '\0';
274 static void set_from_env(const char **var, const char *envname)
276 const char *val = getenv(envname);
277 if (val)
278 *var = val;
281 void http_init(struct remote *remote)
283 char *low_speed_limit;
284 char *low_speed_time;
286 http_is_verbose = 0;
288 git_config(http_options, NULL);
290 curl_global_init(CURL_GLOBAL_ALL);
292 if (remote && remote->http_proxy)
293 curl_http_proxy = xstrdup(remote->http_proxy);
295 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
296 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
298 #ifdef USE_CURL_MULTI
300 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
301 if (http_max_requests != NULL)
302 max_requests = atoi(http_max_requests);
305 curlm = curl_multi_init();
306 if (curlm == NULL) {
307 fprintf(stderr, "Error creating curl multi handle.\n");
308 exit(1);
310 #endif
312 if (getenv("GIT_SSL_NO_VERIFY"))
313 curl_ssl_verify = 0;
315 set_from_env(&ssl_cert, "GIT_SSL_CERT");
316 #if LIBCURL_VERSION_NUM >= 0x070903
317 set_from_env(&ssl_key, "GIT_SSL_KEY");
318 #endif
319 #if LIBCURL_VERSION_NUM >= 0x070908
320 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
321 #endif
322 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
324 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
325 if (low_speed_limit != NULL)
326 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
327 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
328 if (low_speed_time != NULL)
329 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
331 if (curl_ssl_verify == -1)
332 curl_ssl_verify = 1;
334 #ifdef USE_CURL_MULTI
335 if (max_requests < 1)
336 max_requests = DEFAULT_MAX_REQUESTS;
337 #endif
339 if (getenv("GIT_CURL_FTP_NO_EPSV"))
340 curl_ftp_no_epsv = 1;
342 if (remote && remote->url && remote->url[0])
343 http_auth_init(remote->url[0]);
345 #ifndef NO_CURL_EASY_DUPHANDLE
346 curl_default = get_curl_handle();
347 #endif
350 void http_cleanup(void)
352 struct active_request_slot *slot = active_queue_head;
354 while (slot != NULL) {
355 struct active_request_slot *next = slot->next;
356 if (slot->curl != NULL) {
357 #ifdef USE_CURL_MULTI
358 curl_multi_remove_handle(curlm, slot->curl);
359 #endif
360 curl_easy_cleanup(slot->curl);
362 free(slot);
363 slot = next;
365 active_queue_head = NULL;
367 #ifndef NO_CURL_EASY_DUPHANDLE
368 curl_easy_cleanup(curl_default);
369 #endif
371 #ifdef USE_CURL_MULTI
372 curl_multi_cleanup(curlm);
373 #endif
374 curl_global_cleanup();
376 curl_slist_free_all(pragma_header);
377 pragma_header = NULL;
379 curl_slist_free_all(no_pragma_header);
380 no_pragma_header = NULL;
382 if (curl_http_proxy) {
383 free((void *)curl_http_proxy);
384 curl_http_proxy = NULL;
388 struct active_request_slot *get_active_slot(void)
390 struct active_request_slot *slot = active_queue_head;
391 struct active_request_slot *newslot;
393 #ifdef USE_CURL_MULTI
394 int num_transfers;
396 /* Wait for a slot to open up if the queue is full */
397 while (active_requests >= max_requests) {
398 curl_multi_perform(curlm, &num_transfers);
399 if (num_transfers < active_requests)
400 process_curl_messages();
402 #endif
404 while (slot != NULL && slot->in_use)
405 slot = slot->next;
407 if (slot == NULL) {
408 newslot = xmalloc(sizeof(*newslot));
409 newslot->curl = NULL;
410 newslot->in_use = 0;
411 newslot->next = NULL;
413 slot = active_queue_head;
414 if (slot == NULL) {
415 active_queue_head = newslot;
416 } else {
417 while (slot->next != NULL)
418 slot = slot->next;
419 slot->next = newslot;
421 slot = newslot;
424 if (slot->curl == NULL) {
425 #ifdef NO_CURL_EASY_DUPHANDLE
426 slot->curl = get_curl_handle();
427 #else
428 slot->curl = curl_easy_duphandle(curl_default);
429 #endif
432 active_requests++;
433 slot->in_use = 1;
434 slot->local = NULL;
435 slot->results = NULL;
436 slot->finished = NULL;
437 slot->callback_data = NULL;
438 slot->callback_func = NULL;
439 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
440 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
441 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
442 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
443 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
444 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
445 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
447 return slot;
450 int start_active_slot(struct active_request_slot *slot)
452 #ifdef USE_CURL_MULTI
453 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
454 int num_transfers;
456 if (curlm_result != CURLM_OK &&
457 curlm_result != CURLM_CALL_MULTI_PERFORM) {
458 active_requests--;
459 slot->in_use = 0;
460 return 0;
464 * We know there must be something to do, since we just added
465 * something.
467 curl_multi_perform(curlm, &num_transfers);
468 #endif
469 return 1;
472 #ifdef USE_CURL_MULTI
473 struct fill_chain {
474 void *data;
475 int (*fill)(void *);
476 struct fill_chain *next;
479 static struct fill_chain *fill_cfg;
481 void add_fill_function(void *data, int (*fill)(void *))
483 struct fill_chain *new = xmalloc(sizeof(*new));
484 struct fill_chain **linkp = &fill_cfg;
485 new->data = data;
486 new->fill = fill;
487 new->next = NULL;
488 while (*linkp)
489 linkp = &(*linkp)->next;
490 *linkp = new;
493 void fill_active_slots(void)
495 struct active_request_slot *slot = active_queue_head;
497 while (active_requests < max_requests) {
498 struct fill_chain *fill;
499 for (fill = fill_cfg; fill; fill = fill->next)
500 if (fill->fill(fill->data))
501 break;
503 if (!fill)
504 break;
507 while (slot != NULL) {
508 if (!slot->in_use && slot->curl != NULL) {
509 curl_easy_cleanup(slot->curl);
510 slot->curl = NULL;
512 slot = slot->next;
516 void step_active_slots(void)
518 int num_transfers;
519 CURLMcode curlm_result;
521 do {
522 curlm_result = curl_multi_perform(curlm, &num_transfers);
523 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
524 if (num_transfers < active_requests) {
525 process_curl_messages();
526 fill_active_slots();
529 #endif
531 void run_active_slot(struct active_request_slot *slot)
533 #ifdef USE_CURL_MULTI
534 long last_pos = 0;
535 long current_pos;
536 fd_set readfds;
537 fd_set writefds;
538 fd_set excfds;
539 int max_fd;
540 struct timeval select_timeout;
541 int finished = 0;
543 slot->finished = &finished;
544 while (!finished) {
545 data_received = 0;
546 step_active_slots();
548 if (!data_received && slot->local != NULL) {
549 current_pos = ftell(slot->local);
550 if (current_pos > last_pos)
551 data_received++;
552 last_pos = current_pos;
555 if (slot->in_use && !data_received) {
556 max_fd = 0;
557 FD_ZERO(&readfds);
558 FD_ZERO(&writefds);
559 FD_ZERO(&excfds);
560 select_timeout.tv_sec = 0;
561 select_timeout.tv_usec = 50000;
562 select(max_fd, &readfds, &writefds,
563 &excfds, &select_timeout);
566 #else
567 while (slot->in_use) {
568 slot->curl_result = curl_easy_perform(slot->curl);
569 finish_active_slot(slot);
571 #endif
574 static void closedown_active_slot(struct active_request_slot *slot)
576 active_requests--;
577 slot->in_use = 0;
580 void release_active_slot(struct active_request_slot *slot)
582 closedown_active_slot(slot);
583 if (slot->curl) {
584 #ifdef USE_CURL_MULTI
585 curl_multi_remove_handle(curlm, slot->curl);
586 #endif
587 curl_easy_cleanup(slot->curl);
588 slot->curl = NULL;
590 #ifdef USE_CURL_MULTI
591 fill_active_slots();
592 #endif
595 static void finish_active_slot(struct active_request_slot *slot)
597 closedown_active_slot(slot);
598 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
600 if (slot->finished != NULL)
601 (*slot->finished) = 1;
603 /* Store slot results so they can be read after the slot is reused */
604 if (slot->results != NULL) {
605 slot->results->curl_result = slot->curl_result;
606 slot->results->http_code = slot->http_code;
609 /* Run callback if appropriate */
610 if (slot->callback_func != NULL)
611 slot->callback_func(slot->callback_data);
614 void finish_all_active_slots(void)
616 struct active_request_slot *slot = active_queue_head;
618 while (slot != NULL)
619 if (slot->in_use) {
620 run_active_slot(slot);
621 slot = active_queue_head;
622 } else {
623 slot = slot->next;
627 /* Helpers for modifying and creating URLs */
628 static inline int needs_quote(int ch)
630 if (((ch >= 'A') && (ch <= 'Z'))
631 || ((ch >= 'a') && (ch <= 'z'))
632 || ((ch >= '0') && (ch <= '9'))
633 || (ch == '/')
634 || (ch == '-')
635 || (ch == '.'))
636 return 0;
637 return 1;
640 static inline int hex(int v)
642 if (v < 10)
643 return '0' + v;
644 else
645 return 'A' + v - 10;
648 static void end_url_with_slash(struct strbuf *buf, const char *url)
650 strbuf_addstr(buf, url);
651 if (buf->len && buf->buf[buf->len - 1] != '/')
652 strbuf_addstr(buf, "/");
655 static char *quote_ref_url(const char *base, const char *ref)
657 struct strbuf buf = STRBUF_INIT;
658 const char *cp;
659 int ch;
661 end_url_with_slash(&buf, base);
663 for (cp = ref; (ch = *cp) != 0; cp++)
664 if (needs_quote(ch))
665 strbuf_addf(&buf, "%%%02x", ch);
666 else
667 strbuf_addch(&buf, *cp);
669 return strbuf_detach(&buf, NULL);
672 void append_remote_object_url(struct strbuf *buf, const char *url,
673 const char *hex,
674 int only_two_digit_prefix)
676 strbuf_addf(buf, "%s/objects/%.*s/", url, 2, hex);
677 if (!only_two_digit_prefix)
678 strbuf_addf(buf, "%s", hex+2);
681 char *get_remote_object_url(const char *url, const char *hex,
682 int only_two_digit_prefix)
684 struct strbuf buf = STRBUF_INIT;
685 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
686 return strbuf_detach(&buf, NULL);
689 /* http_request() targets */
690 #define HTTP_REQUEST_STRBUF 0
691 #define HTTP_REQUEST_FILE 1
693 static int http_request(const char *url, void *result, int target, int options)
695 struct active_request_slot *slot;
696 struct slot_results results;
697 struct curl_slist *headers = NULL;
698 struct strbuf buf = STRBUF_INIT;
699 int ret;
701 slot = get_active_slot();
702 slot->results = &results;
703 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
705 if (result == NULL) {
706 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
707 } else {
708 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
709 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
711 if (target == HTTP_REQUEST_FILE) {
712 long posn = ftell(result);
713 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
714 fwrite);
715 if (posn > 0) {
716 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
717 headers = curl_slist_append(headers, buf.buf);
718 strbuf_reset(&buf);
720 slot->local = result;
721 } else
722 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
723 fwrite_buffer);
726 strbuf_addstr(&buf, "Pragma:");
727 if (options & HTTP_NO_CACHE)
728 strbuf_addstr(&buf, " no-cache");
730 headers = curl_slist_append(headers, buf.buf);
732 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
733 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
735 if (start_active_slot(slot)) {
736 run_active_slot(slot);
737 if (results.curl_result == CURLE_OK)
738 ret = HTTP_OK;
739 else if (missing_target(&results))
740 ret = HTTP_MISSING_TARGET;
741 else
742 ret = HTTP_ERROR;
743 } else {
744 error("Unable to start HTTP request for %s", url);
745 ret = HTTP_START_FAILED;
748 slot->local = NULL;
749 curl_slist_free_all(headers);
750 strbuf_release(&buf);
752 return ret;
755 int http_get_strbuf(const char *url, struct strbuf *result, int options)
757 return http_request(url, result, HTTP_REQUEST_STRBUF, options);
760 int http_get_file(const char *url, const char *filename, int options)
762 int ret;
763 struct strbuf tmpfile = STRBUF_INIT;
764 FILE *result;
766 strbuf_addf(&tmpfile, "%s.temp", filename);
767 result = fopen(tmpfile.buf, "a");
768 if (! result) {
769 error("Unable to open local file %s", tmpfile.buf);
770 ret = HTTP_ERROR;
771 goto cleanup;
774 ret = http_request(url, result, HTTP_REQUEST_FILE, options);
775 fclose(result);
777 if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
778 ret = HTTP_ERROR;
779 cleanup:
780 strbuf_release(&tmpfile);
781 return ret;
784 int http_error(const char *url, int ret)
786 /* http_request has already handled HTTP_START_FAILED. */
787 if (ret != HTTP_START_FAILED)
788 error("%s while accessing %s\n", curl_errorstr, url);
790 return ret;
793 int http_fetch_ref(const char *base, struct ref *ref)
795 char *url;
796 struct strbuf buffer = STRBUF_INIT;
797 int ret = -1;
799 url = quote_ref_url(base, ref->name);
800 if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
801 strbuf_rtrim(&buffer);
802 if (buffer.len == 40)
803 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
804 else if (!prefixcmp(buffer.buf, "ref: ")) {
805 ref->symref = xstrdup(buffer.buf + 5);
806 ret = 0;
810 strbuf_release(&buffer);
811 free(url);
812 return ret;
815 /* Helpers for fetching packs */
816 static int fetch_pack_index(unsigned char *sha1, const char *base_url)
818 int ret = 0;
819 char *hex = xstrdup(sha1_to_hex(sha1));
820 char *filename;
821 char *url;
822 struct strbuf buf = STRBUF_INIT;
824 /* Don't use the index if the pack isn't there */
825 end_url_with_slash(&buf, base_url);
826 strbuf_addf(&buf, "objects/pack/pack-%s.pack", hex);
827 url = strbuf_detach(&buf, 0);
829 if (http_get_strbuf(url, NULL, 0)) {
830 ret = error("Unable to verify pack %s is available",
831 hex);
832 goto cleanup;
835 if (has_pack_index(sha1)) {
836 ret = 0;
837 goto cleanup;
840 if (http_is_verbose)
841 fprintf(stderr, "Getting index for pack %s\n", hex);
843 end_url_with_slash(&buf, base_url);
844 strbuf_addf(&buf, "objects/pack/pack-%s.idx", hex);
845 url = strbuf_detach(&buf, NULL);
847 filename = sha1_pack_index_name(sha1);
848 if (http_get_file(url, filename, 0) != HTTP_OK)
849 ret = error("Unable to get pack index %s\n", url);
851 cleanup:
852 free(hex);
853 free(url);
854 return ret;
857 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
858 unsigned char *sha1, const char *base_url)
860 struct packed_git *new_pack;
862 if (fetch_pack_index(sha1, base_url))
863 return -1;
865 new_pack = parse_pack_index(sha1);
866 if (!new_pack)
867 return -1; /* parse_pack_index() already issued error message */
868 new_pack->next = *packs_head;
869 *packs_head = new_pack;
870 return 0;
873 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
875 int ret = 0, i = 0;
876 char *url, *data;
877 struct strbuf buf = STRBUF_INIT;
878 unsigned char sha1[20];
880 end_url_with_slash(&buf, base_url);
881 strbuf_addstr(&buf, "objects/info/packs");
882 url = strbuf_detach(&buf, NULL);
884 ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
885 if (ret != HTTP_OK)
886 goto cleanup;
888 data = buf.buf;
889 while (i < buf.len) {
890 switch (data[i]) {
891 case 'P':
892 i++;
893 if (i + 52 <= buf.len &&
894 !prefixcmp(data + i, " pack-") &&
895 !prefixcmp(data + i + 46, ".pack\n")) {
896 get_sha1_hex(data + i + 6, sha1);
897 fetch_and_setup_pack_index(packs_head, sha1,
898 base_url);
899 i += 51;
900 break;
902 default:
903 while (i < buf.len && data[i] != '\n')
904 i++;
906 i++;
909 cleanup:
910 free(url);
911 return ret;
914 void release_http_pack_request(struct http_pack_request *preq)
916 if (preq->packfile != NULL) {
917 fclose(preq->packfile);
918 preq->packfile = NULL;
919 preq->slot->local = NULL;
921 if (preq->range_header != NULL) {
922 curl_slist_free_all(preq->range_header);
923 preq->range_header = NULL;
925 preq->slot = NULL;
926 free(preq->url);
929 int finish_http_pack_request(struct http_pack_request *preq)
931 int ret;
932 struct packed_git **lst;
934 preq->target->pack_size = ftell(preq->packfile);
936 if (preq->packfile != NULL) {
937 fclose(preq->packfile);
938 preq->packfile = NULL;
939 preq->slot->local = NULL;
942 ret = move_temp_to_file(preq->tmpfile, preq->filename);
943 if (ret)
944 return ret;
946 lst = preq->lst;
947 while (*lst != preq->target)
948 lst = &((*lst)->next);
949 *lst = (*lst)->next;
951 if (verify_pack(preq->target))
952 return -1;
953 install_packed_git(preq->target);
955 return 0;
958 struct http_pack_request *new_http_pack_request(
959 struct packed_git *target, const char *base_url)
961 char *url;
962 char *filename;
963 long prev_posn = 0;
964 char range[RANGE_HEADER_SIZE];
965 struct strbuf buf = STRBUF_INIT;
966 struct http_pack_request *preq;
968 preq = xmalloc(sizeof(*preq));
969 preq->target = target;
970 preq->range_header = NULL;
972 end_url_with_slash(&buf, base_url);
973 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
974 sha1_to_hex(target->sha1));
975 url = strbuf_detach(&buf, NULL);
976 preq->url = xstrdup(url);
978 filename = sha1_pack_name(target->sha1);
979 snprintf(preq->filename, sizeof(preq->filename), "%s", filename);
980 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp", filename);
981 preq->packfile = fopen(preq->tmpfile, "a");
982 if (!preq->packfile) {
983 error("Unable to open local file %s for pack",
984 preq->tmpfile);
985 goto abort;
988 preq->slot = get_active_slot();
989 preq->slot->local = preq->packfile;
990 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
991 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
992 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, url);
993 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
994 no_pragma_header);
997 * If there is data present from a previous transfer attempt,
998 * resume where it left off
1000 prev_posn = ftell(preq->packfile);
1001 if (prev_posn>0) {
1002 if (http_is_verbose)
1003 fprintf(stderr,
1004 "Resuming fetch of pack %s at byte %ld\n",
1005 sha1_to_hex(target->sha1), prev_posn);
1006 sprintf(range, "Range: bytes=%ld-", prev_posn);
1007 preq->range_header = curl_slist_append(NULL, range);
1008 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1009 preq->range_header);
1012 return preq;
1014 abort:
1015 free(filename);
1016 return NULL;
1019 /* Helpers for fetching objects (loose) */
1020 static size_t fwrite_sha1_file(void *ptr, size_t eltsize, size_t nmemb,
1021 void *data)
1023 unsigned char expn[4096];
1024 size_t size = eltsize * nmemb;
1025 int posn = 0;
1026 struct http_object_request *freq =
1027 (struct http_object_request *)data;
1028 do {
1029 ssize_t retval = xwrite(freq->localfile,
1030 (char *) ptr + posn, size - posn);
1031 if (retval < 0)
1032 return posn;
1033 posn += retval;
1034 } while (posn < size);
1036 freq->stream.avail_in = size;
1037 freq->stream.next_in = ptr;
1038 do {
1039 freq->stream.next_out = expn;
1040 freq->stream.avail_out = sizeof(expn);
1041 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1042 git_SHA1_Update(&freq->c, expn,
1043 sizeof(expn) - freq->stream.avail_out);
1044 } while (freq->stream.avail_in && freq->zret == Z_OK);
1045 data_received++;
1046 return size;
1049 struct http_object_request *new_http_object_request(const char *base_url,
1050 unsigned char *sha1)
1052 char *hex = sha1_to_hex(sha1);
1053 char *filename;
1054 char prevfile[PATH_MAX];
1055 char *url;
1056 int prevlocal;
1057 unsigned char prev_buf[PREV_BUF_SIZE];
1058 ssize_t prev_read = 0;
1059 long prev_posn = 0;
1060 char range[RANGE_HEADER_SIZE];
1061 struct curl_slist *range_header = NULL;
1062 struct http_object_request *freq;
1064 freq = xmalloc(sizeof(*freq));
1065 hashcpy(freq->sha1, sha1);
1066 freq->localfile = -1;
1068 filename = sha1_file_name(sha1);
1069 snprintf(freq->filename, sizeof(freq->filename), "%s", filename);
1070 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1071 "%s.temp", filename);
1073 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1074 unlink_or_warn(prevfile);
1075 rename(freq->tmpfile, prevfile);
1076 unlink_or_warn(freq->tmpfile);
1078 if (freq->localfile != -1)
1079 error("fd leakage in start: %d", freq->localfile);
1080 freq->localfile = open(freq->tmpfile,
1081 O_WRONLY | O_CREAT | O_EXCL, 0666);
1083 * This could have failed due to the "lazy directory creation";
1084 * try to mkdir the last path component.
1086 if (freq->localfile < 0 && errno == ENOENT) {
1087 char *dir = strrchr(freq->tmpfile, '/');
1088 if (dir) {
1089 *dir = 0;
1090 mkdir(freq->tmpfile, 0777);
1091 *dir = '/';
1093 freq->localfile = open(freq->tmpfile,
1094 O_WRONLY | O_CREAT | O_EXCL, 0666);
1097 if (freq->localfile < 0) {
1098 error("Couldn't create temporary file %s for %s: %s",
1099 freq->tmpfile, freq->filename, strerror(errno));
1100 goto abort;
1103 memset(&freq->stream, 0, sizeof(freq->stream));
1105 git_inflate_init(&freq->stream);
1107 git_SHA1_Init(&freq->c);
1109 url = get_remote_object_url(base_url, hex, 0);
1110 freq->url = xstrdup(url);
1113 * If a previous temp file is present, process what was already
1114 * fetched.
1116 prevlocal = open(prevfile, O_RDONLY);
1117 if (prevlocal != -1) {
1118 do {
1119 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1120 if (prev_read>0) {
1121 if (fwrite_sha1_file(prev_buf,
1123 prev_read,
1124 freq) == prev_read) {
1125 prev_posn += prev_read;
1126 } else {
1127 prev_read = -1;
1130 } while (prev_read > 0);
1131 close(prevlocal);
1133 unlink_or_warn(prevfile);
1136 * Reset inflate/SHA1 if there was an error reading the previous temp
1137 * file; also rewind to the beginning of the local file.
1139 if (prev_read == -1) {
1140 memset(&freq->stream, 0, sizeof(freq->stream));
1141 git_inflate_init(&freq->stream);
1142 git_SHA1_Init(&freq->c);
1143 if (prev_posn>0) {
1144 prev_posn = 0;
1145 lseek(freq->localfile, 0, SEEK_SET);
1146 ftruncate(freq->localfile, 0);
1150 freq->slot = get_active_slot();
1152 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1153 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1154 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1155 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, url);
1156 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1159 * If we have successfully processed data from a previous fetch
1160 * attempt, only fetch the data we don't already have.
1162 if (prev_posn>0) {
1163 if (http_is_verbose)
1164 fprintf(stderr,
1165 "Resuming fetch of object %s at byte %ld\n",
1166 hex, prev_posn);
1167 sprintf(range, "Range: bytes=%ld-", prev_posn);
1168 range_header = curl_slist_append(range_header, range);
1169 curl_easy_setopt(freq->slot->curl,
1170 CURLOPT_HTTPHEADER, range_header);
1173 return freq;
1175 free(url);
1176 abort:
1177 free(filename);
1178 free(freq);
1179 return NULL;
1182 void process_http_object_request(struct http_object_request *freq)
1184 if (freq->slot == NULL)
1185 return;
1186 freq->curl_result = freq->slot->curl_result;
1187 freq->http_code = freq->slot->http_code;
1188 freq->slot = NULL;
1191 int finish_http_object_request(struct http_object_request *freq)
1193 struct stat st;
1195 close(freq->localfile);
1196 freq->localfile = -1;
1198 process_http_object_request(freq);
1200 if (freq->http_code == 416) {
1201 fprintf(stderr, "Warning: requested range invalid; we may already have all the data.\n");
1202 } else if (freq->curl_result != CURLE_OK) {
1203 if (stat(freq->tmpfile, &st) == 0)
1204 if (st.st_size == 0)
1205 unlink_or_warn(freq->tmpfile);
1206 return -1;
1209 git_inflate_end(&freq->stream);
1210 git_SHA1_Final(freq->real_sha1, &freq->c);
1211 if (freq->zret != Z_STREAM_END) {
1212 unlink_or_warn(freq->tmpfile);
1213 return -1;
1215 if (hashcmp(freq->sha1, freq->real_sha1)) {
1216 unlink_or_warn(freq->tmpfile);
1217 return -1;
1219 freq->rename =
1220 move_temp_to_file(freq->tmpfile, freq->filename);
1222 return freq->rename;
1225 void abort_http_object_request(struct http_object_request *freq)
1227 unlink_or_warn(freq->tmpfile);
1229 release_http_object_request(freq);
1232 void release_http_object_request(struct http_object_request *freq)
1234 if (freq->localfile != -1) {
1235 close(freq->localfile);
1236 freq->localfile = -1;
1238 if (freq->url != NULL) {
1239 free(freq->url);
1240 freq->url = NULL;
1242 freq->slot = NULL;